Document API key and ChatGPT OAuth routing flows for using Codex models in Claude Code, including configuration screenshots and troubleshooting guidance.
Step-by-step guide for the v3.17.0 native Anthropic Messages upstream:
add a custom Codex provider pointed at a Claude-family /v1/messages
gateway, pick the anthropic upstream format, enable local routing, and
verify the chain. Covers the auth-field choice (Bearer vs x-api-key),
the Claude Code impersonation toggle, the 8192 max-output fallback, and
a FAQ entry for gateways that restrict keys to Claude Code only.
Includes four UI screenshots captured from the real 3.17.0 app with
sample data, and links the guide from the v3.17.0 release notes in all
three languages.